Jaap: It would be really helpfull if you posted more code. Especially what you do further with the $r object.

Actually, there is not much more code to post in this example. Except the normal, use statments, and I am doing nothing more with the $r object.

Jaap: Why do you want to set header_in?

Because a browser that has support for only one language, lets say "zu", cannot be handled properly by Apache's multiviews directive. (The multiviews directive has been extended to address the issue in Apache2, but upgrading is not an option for me at the moment) I am intercepting the headers, and adding a default language support of "en" then passing the request on to Apache -- The web server never knows the visitor's browser does not have English language support, and multiviews can do the negotiations.